Optimized aerodynamic profile for a turbine vane, in particular for a nozzle of the fourth stage of a turbine

ABSTRACT

When cold and in the non-coated state, the aerodynamic profile is substantially identical to a nominal profile determined by the Cartesian coordinates X,Y, Zadim given in Table 1, in which the coordinate Zadim is the quotient D/H where D is the distance of the point under consideration from a first reference plane P 0  situated at the base of the nominal profile, and H is the height of said profile measured from the first reference plane to a second reference plane P 1 . The measurements D and H are taken radially relative to the axis of the turbine, while the X coordinate is measured in the axial direction of the turbine.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This patent application claims the benefit under 35 U.S.C. § 119 to U.S. Provisional Application No. 62/361,540, filed on Jul. 13, 2016, the entirety of which is incorporated herein by reference.

FIELD OF THE DISCLOSURE

The present invention relates to an aerodynamic profile for a turbine vane.

INTRODUCTION

In particular, the invention relates to the aerodynamic profile of a nozzle vane forming a portion of the stator of a gas turbine, and more particularly of a low pressure turbine of the type used in a turbojet of an aircraft.

The invention relates in particular to a nozzle vane of the fourth stage of a turbine having a plurality of stages, preferably seven stages.

Such a profile should enable the turbine to provide the desired efficiency, and in order to do that it must be such that the flow of air around the profile is sound over the working spectrum of the turbine, i.e. substantially such that it does not give rise to turbulence, which is harmful for overall efficiency.

It must be capable of being installed properly in the environment of the engine, and in particular, for a nozzle vane forming a portion of the stator of the turbine, it must be capable of being fastened easily to the sectors of the foot platform (the zone of the vane that is furthest from the axis of rotation of the turbine) and of the head platform (the zone that is closest to said axis). Furthermore, this part must present a profile enabling it to be manufactured in a reliable and cost-effective manner by available manufacturing methods, such as casting, forging, machining, additive fabrication, or else weaving, without this list being limitative.

Furthermore, the profile of the vane must enable it to withstand the mechanical stresses, to which the vane is subjected, by enabling those stresses to be spread over the entire vane in such a manner as to avoid premature wear thereof. This spreading must apply both in static mode and in dynamic mode.

An object of the invention is to propose an aerodynamic profile for a turbine vane that is optimized, and capable of satisfying those objectives.

This object is achieved by the fact that when cold and in a non-coated state, said profile is substantially identical to a nominal profile determined by the Cartesian coordinates X,Y,Zadim given in Table 1, in which the coordinate Zadim is the quotient D/H where D is the distance of the point P under consideration from a reference X,Y plane situated at the base of the nominal profile, and H is the height of said profile measured from said reference plane that is the intersection of the stacking axis of the set of vanes and the axisymmetric surface of the hub, out to a second reference plane that is the intersection of said stacking axis with the axisymmetric surface of the casing, the measurements D and H being taken radially relative to the axis of the turbine, while the coordinate X is measured in the axial direction of the turbine.

This profile has been determined as a result of numerous tests and simulations. It is defined cold, i.e. at an ambient temperature of 20° C. That is a reference temperature at which the profile is geometrically determined. The above-mentioned objectives of aerodynamics and mechanical optimization are naturally valid for the conditions of use of this aerodynamic profile, i.e. when hot, at a temperature that is stabilized when the engine of which the turbine forms a part is being used under cruising conditions.

Furthermore, the aerodynamic profile of the invention is defined in the non-coated state. Since turbine vanes are subjected to high temperature gradients, it is common practice for them to be provided with a coating having thermal properties enabling them more easily to withstand such temperature variations. The profile is determined prior to installing such a coating.

It is stated above that the profile of the invention is “substantially identical” to the nominal profile. This means that the profile may depart very slightly from said nominal profile.

The aerodynamic profile is thus preferably defined within an envelope of ±1 millimeter (mm) in a direction normal to the surface of the nominal profile.

This variation takes account in particular of manufacturing tolerances of the profile.

It is also preferable for the X,Y coordinates of the aerodynamic profile to lie within a range of ±5% relative to the X,Y coordinates of the nominal profile.

This variation takes account of the setting of the profile to adapt to the flow coming from the blades of the turbine situated upstream, so as to further improve the efficiency of the turbine. In particular, the profile is adapted so as to be optimized for the flow coming from the rotary wheel of the third stage of a turbine when the vane of the invention belongs to the nozzle of the fourth stage of a turbine.

With a nozzle vane, i.e. a portion of the stator of a turbine, the profile serves to orient the fluid correctly for the turbine blades that are situated downstream, and that belong in particular to the rotary wheel of the fourth stage of the turbine.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention can be better understood and its advantages appear better on reading the following detailed description of an embodiment given by way of non-limiting example. The description refers to the accompanying drawings, in which:

FIG. 1 is a fragmentary axial section view of a turbine including a vane of profile that corresponds to that of the invention;

FIG. 2 is an enlarged view of FIG. 1, showing the fourth stage of the turbine.

DETAILED DESCRIPTION

The turbine shown in axial section in FIG. 1 comprises seven stages referenced respectively S1 to S7. In the direction DF going from upstream to downstream, each stage comprises a nozzle that forms a portion of the stator of the turbine and that has a plurality of radially-oriented vanes, and a rotary wheel that forms a portion of the rotor of the turbine and that likewise includes a plurality of radially-oriented blades.

In FIG. 1, the vanes of the nozzles of stages S1 to S7 are given references N1 to N7, whereas the blades of rotary wheels of stages S1 to S7 are given respective references W1 to W7.

In known manner, the vanes of the nozzles are fastened at both ends to stationary structure portions, while the blades of the rotary wheels are fastened to a rotary disk via their roots that are formed at their radially-inner ends closer to the axis of the rotation A of the turbine. The disks d1 to d7 forming parts of the wheels W1 to W7 are constrained to rotate together.

The invention relates in particular to a vane N4 which is a vane of the nozzle of the fourth stage S4 of the turbine that, as mentioned above, preferably comprises seven stages as shown, without this number being limiting.

As best seen in FIG. 2, via its foot 10, which is its end remote from the axis of rotation A, the vane N4 is fastened to the outer ring 12 of the turbine, which ring is stationary in rotation. Via its head 14, formed by its end closer to the axis of rotation A, the vane is fastened to an inner shroud 16 of the turbine. By convention, the aerodynamic profile 18 of the vane is the entire portion of said vane that extends radially outwards from its head 14 to its foot 10 without incorporating the fastenings respectively to the outer ring 12 and to the inner shroud 16.

In FIG. 2, there can be seen a frame of reference comprising Cartesian coordinates X,Y,Z. The radial direction Z is the height direction of the vane, which extends radially from its head to its foot. This direction Z is perpendicular to the axial direction X which is the direction of the axis of rotation A of the turbine. The direction Y is perpendicular to the X,Z plane and is therefore tangential to the direction of rotation of the turbine.

The nominal profile from which the aerodynamic profile of the invention is determined is defined in following Table 1 of coordinates, in which the coordinate Zadim, measured along the axis Z is non-dimensional, whereas the dimensions X and Y, respectively measured along the axes X and Y, are expressed in millimeters.

TABLE 1 X Y Zadim −18.2402 3.758554 −0.12475 −18.27 3.720186 −0.12475 −18.3072 3.660284 −0.12475 −18.3501 3.560279 −0.12475 −18.377 3.411151 −0.12475 −18.3647 3.213759 −0.12475 −18.2992 2.975383 −0.12475 −18.1752 2.703836 −0.12475 −17.9914 2.404749 −0.12475 −17.7462 2.083467 −0.12475 −17.4376 1.746352 −0.12475 −17.0631 1.401188 −0.12475 −16.6204 1.057975 −0.12475 −16.1072 0.729966 −0.12475 −15.5228 0.432395 −0.12475 −14.8679 0.185889 −0.12475 −14.148 0.013132 −0.12475 −13.3743 −0.06045 −0.12475 −12.565 −0.01729 −0.12475 −11.7423 0.150901 −0.12475 −10.9271 0.43848 −0.12475 −10.1318 0.825676 −0.12475 −9.36127 1.290573 −0.12475 −8.61745 1.815148 −0.12475 −7.90294 2.387476 −0.12475 −7.21954 2.996957 −0.12475 −6.56786 3.63334 −0.12475 −5.95149 4.29054 −0.12475 −5.37343 4.962303 −0.12475 −4.83887 5.644481 −0.12475 −4.34726 6.328699 −0.12475 −3.89257 7.00374 −0.12475 −3.48118 7.667755 −0.12475 −3.10698 8.311363 −0.12475 −2.7677 8.928541 −0.12475 −2.45901 9.512949 −0.12475 −2.17861 10.06008 −0.12475 −1.92437 10.5662 −0.12475 −1.69476 11.02847 −0.12475 −1.48801 11.44463 −0.12475 −1.30377 11.81372 −0.12475 −1.14135 12.13535 −0.12475 −1.00081 12.4102 −0.12475 −0.88186 12.6396 −0.12475 −0.78408 12.82565 −0.12475 −0.70777 12.97181 −0.12475 −0.70582 13.09209 −0.12475 −0.75272 13.16344 −0.12475 −0.79445 13.19789 −0.12475 −0.83134 13.21704 −0.12475 −0.86384 13.22779 −0.12475 −0.90787 13.23491 −0.12475 −0.97833 13.23046 −0.12475 −1.06692 13.18651 −0.12475 −1.13936 13.07185 −0.12475 −1.23134 12.92537 −0.12475 −1.34642 12.74654 −0.12475 −1.48647 12.53458 −0.12475 −1.6528 12.2891 −0.12475 −1.84634 12.01019 −0.12475 −2.06852 11.69894 −0.12475 −2.31666 11.35417 −0.12475 −2.59955 10.9839 −0.12475 −2.92456 10.59735 −0.12475 −3.29423 10.2008 −0.12475 −3.70913 9.79744 −0.12475 −4.16883 9.389512 −0.12475 −4.67019 8.979379 −0.12475 −5.20776 8.569188 −0.12475 −5.77418 8.159969 −0.12475 −6.36031 7.751641 −0.12475 −6.95614 7.343748 −0.12475 −7.55179 6.930359 −0.12475 −8.14257 6.514699 −0.12475 −8.72824 6.102633 −0.12475 −9.31469 5.698159 −0.12475 −9.91144 5.305774 −0.12475 −10.5305 4.929263 −0.12475 −11.1751 4.577391 −0.12475 −11.8335 4.266935 −0.12475 −12.4833 4.01358 −0.12475 −13.1011 3.824332 −0.12475 −13.6734 3.695956 −0.12475 −14.1966 3.619384 −0.12475 −14.6773 3.584558 −0.12475 −15.1269 3.583842 −0.12475 −15.5559 3.613105 −0.12475 −15.965 3.66965 −0.12475 −16.3466 3.748794 −0.12475 −16.6958 3.842304 −0.12475 −17.0147 3.936167 −0.12475 −17.3093 4.010132 −0.12475 −17.5805 4.037479 −0.12475 −17.8134 4.014628 −0.12475 −17.9895 3.956055 −0.12475 −18.104 3.888866 −0.12475 −18.1736 3.83045 −0.12475 −18.4065 3.915947 −0.07143 −18.4392 3.877184 −0.07143 −18.4799 3.815783 −0.07143 −18.5257 3.711889 −0.07143 −18.5541 3.556226 −0.07143 −18.5416 3.350068 −0.07143 −18.4751 3.100618 −0.07143 −18.3493 2.815408 −0.07143 −18.1627 2.499917 −0.07143 −17.9135 2.159357 −0.07143 −17.5995 1.799936 −0.07143 −17.2182 1.429319 −0.07143 −16.7668 1.057343 −0.07143 −16.2427 0.696933 −0.07143 −15.6443 0.364019 −0.07143 −14.972 0.077857 −0.07143 −14.2294 −0.13725 −0.07143 −13.4264 −0.25655 −0.07143 −12.5802 −0.25524 −0.07143 −11.7135 −0.12229 −0.07143 −10.8511 0.143853 −0.07143 −10.0117 0.528811 −0.07143 −9.20613 1.012327 −0.07143 −8.43983 1.574349 −0.07143 −7.71573 2.198316 −0.07143 −7.03441 2.869095 −0.07143 −6.39456 3.572759 −0.07143 −5.79658 4.299083 −0.07143 −5.24149 5.039498 −0.07143 −4.73096 5.786709 −0.07143 −4.26241 6.531291 −0.07143 −3.83043 7.263171 −0.07143 −3.4381 7.978256 −0.07143 −3.08029 8.668392 −0.07143 −2.75426 9.327577 −0.07143 −2.45684 9.950315 −0.07143 −2.1858 10.53226 −0.07143 −1.93933 11.06985 −0.07143 −1.71637 11.56053 −0.07143 −1.51558 12.00224 −0.07143 −1.33673 12.39411 −0.07143 −1.17926 12.73579 −0.07143 −1.04321 13.02801 −0.07143 −0.92825 13.27212 −0.07143 −0.83389 13.47025 −0.07143 −0.76022 13.62579 −0.07143 −0.75198 13.75189 −0.07143 −0.79659 13.82907 −0.07143 −0.83916 13.86617 −0.07143 −0.87754 13.88641 −0.07143 −0.91161 13.89721 −0.07143 −0.95782 13.90294 −0.07143 −1.03059 13.8925 −0.07143 −1.11883 13.83725 −0.07143 −1.19111 13.71552 −0.07143 −1.2824 13.55966 −0.07143 −1.39569 13.36867 −0.07143 −1.53243 13.14134 −0.07143 −1.69368 12.87701 −0.07143 −1.87989 12.57534 −0.07143 −2.09195 12.23697 −0.07143 −2.32933 11.86226 −0.07143 −2.59713 11.45592 −0.07143 −2.90281 11.02572 −0.07143 −3.25169 10.57951 −0.07143 −3.64697 10.12413 −0.07143 −4.08679 9.662374 −0.07143 −4.56882 9.197095 −0.07143 −5.08914 8.730195 −0.07143 −5.64217 8.262362 −0.07143 −6.22071 7.792875 −0.07143 −6.81618 7.320933 −0.07143 −7.4202 6.837768 −0.07143 −8.02595 6.346509 −0.07143 −8.63056 5.85568 −0.07143 −9.24383 5.376959 −0.07143 −9.87074 4.92121 −0.07143 −10.5139 4.499083 −0.07143 −11.1702 4.123375 −0.07143 −11.8285 3.806461 −0.07143 −12.4735 3.555708 −0.07143 −13.0914 3.371675 −0.07143 −13.6747 3.24832 −0.07143 −14.2234 3.177176 −0.07143 −14.7418 3.150413 −0.07143 −15.2372 3.162254 −0.07143 −15.7121 3.208785 −0.07143 −16.1619 3.286356 −0.07143 −16.5765 3.389318 −0.07143 −16.9471 3.511657 −0.07143 −17.2681 3.646215 −0.07143 −17.539 3.781393 −0.07143 −17.7649 3.906907 −0.07143 −17.9562 4.004266 −0.07143 −18.1216 4.046287 −0.07143 −18.25 4.030715 −0.07143 −18.3316 3.985547 −0.07143 −18.6094 4.107134 0 −18.6457 4.067881 0 −18.6906 4.004555 0 −18.7402 3.895658 0 −18.7701 3.73163 0 −18.7573 3.514308 0 −18.6892 3.250856 0 −18.5606 2.94849 0 −18.3698 2.612515 0 −18.115 2.248005 0 −17.7936 1.861012 0 −17.403 1.459092 0 −16.9401 1.05194 0 −16.4018 0.652303 0 −15.7859 0.275787 0 −15.0916 −0.05733 0 −14.3214 −0.32323 0 −13.4832 −0.49497 0 −12.5928 −0.54565 0 −11.6731 −0.45451 0 −10.7531 −0.21316 0 −9.85891 0.170835 0 −9.00922 0.678985 0 −8.21442 1.288278 0 −7.47845 1.976096 0 −6.80046 2.721545 0 −6.17674 3.506233 0 −5.60334 4.315196 0 −5.07849 5.13727 0 −4.59904 5.961832 0 −4.15984 6.77843 0 −3.75645 7.578188 0 −3.38768 8.354746 0 −3.04992 9.101219 0 −2.7399 9.811614 0 −2.45597 10.48128 0 −2.19609 11.10598 0 −1.95881 11.68237 0 −1.74369 12.20811 0 −1.54991 12.68137 0 −1.37743 13.10132 0 −1.22584 13.46774 0 −1.09513 13.78132 0 −0.98493 14.04348 0 −0.89468 14.25645 0 −0.82419 14.42352 0 −0.80834 14.55657 0 −0.8501 14.64067 0 −0.89374 14.68106 0 −0.93402 14.70267 0 −0.97102 14.71383 0 −1.0212 14.71793 0 −1.09846 14.70019 0 −1.18515 14.6274 0 −1.25919 14.49337 0 −1.3527 14.32179 0 −1.46778 14.1109 0 −1.6054 13.85904 0 −1.76616 13.56515 0 −1.95011 13.22862 0 −2.15749 12.84962 0 −2.3882 12.42884 0 −2.64222 11.96759 0 −2.92325 11.46988 0 −3.23681 10.94161 0 −3.58506 10.38743 0 −3.96938 9.812155 0 −4.39031 9.220663 0 −4.84725 8.617659 0 −5.33833 8.007425 0 −5.86052 7.393652 0 −6.40992 6.779433 0 −6.98201 6.167327 0 −7.57189 5.559478 0 −8.17475 4.957908 0 −8.79254 4.371587 0 −9.42637 3.809613 0 −10.0802 3.286086 0 −10.7579 2.819148 0 −11.4603 2.429108 0 −12.1823 2.135349 0 −12.9115 1.953196 0 −13.6289 1.890063 0 −14.3122 1.941846 0 −14.942 2.092473 0 −15.5061 2.317726 0 −16.0008 2.590757 0 −16.4289 2.886518 0 −16.7969 3.183881 0 −17.1139 3.466274 0 −17.3905 3.720994 0 −17.6389 3.937206 0 −17.8711 4.103734 0 −18.0915 4.207451 0 −18.2858 4.240589 0 −18.4304 4.219173 0 −18.5228 4.175713 0 −18.7398 4.219658 0.07975 −18.7782 4.180056 0.07975 −18.8256 4.115458 0.07975 −18.8774 4.003318 0.07975 −18.9082 3.833949 0.07975 −18.8949 3.609554 0.07975 −18.8254 3.337302 0.07975 −18.6948 3.024228 0.07975 −18.501 2.675549 0.07975 −18.242 2.296279 0.07975 −17.9155 1.892408 0.07975 −17.5184 1.471464 0.07975 −17.0475 1.043126 0.07975 −16.4995 0.62014 0.07975 −15.8722 0.217715 0.07975 −15.1638 −0.14328 0.07975 −14.3761 −0.43901 0.07975 −13.5161 −0.64109 0.07975 −12.5987 −0.7211 0.07975 −11.647 −0.6531 0.07975 −10.692 −0.42453 0.07975 −9.76438 −0.03868 0.07975 −8.88771 0.48684 0.07975 −8.07573 1.126914 0.07975 −7.33308 1.855022 0.07975 −6.65803 2.646649 0.07975 −6.04521 3.480644 0.07975 −5.48812 4.339589 0.07975 −4.98278 5.21065 0.07975 −4.52301 6.081571 0.07975 −4.10232 6.941539 0.07975 −3.71661 7.782122 0.07975 −3.36259 8.59608 0.07975 −3.0371 9.376919 0.07975 −2.73683 10.11874 0.07975 −2.46102 10.81727 0.07975 −2.20777 11.46835 0.07975 −1.97594 12.06872 0.07975 −1.76543 12.61615 0.07975 −1.57577 13.10893 0.07975 −1.40702 13.54625 0.07975 −1.25889 13.92793 0.07975 −1.13132 14.25469 0.07975 −1.02393 14.52797 0.07975 −0.9361 14.75006 0.07975 −0.8675 14.92423 0.07975 −0.84702 15.06147 0.07975 −0.88701 15.1497 0.07975 −0.93133 15.19214 0.07975 −0.97281 15.21464 0.07975 −1.01195 15.22608 0.07975 −1.06496 15.22911 0.07975 −1.14535 15.20647 0.07975 −1.23054 15.12239 0.07975 −1.30627 14.97963 0.07975 −1.40189 14.79695 0.07975 −1.51897 14.57208 0.07975 −1.6581 14.30308 0.07975 −1.81963 13.98866 0.07975 −2.0038 13.62827 0.07975 −2.21022 13.2218 0.07975 −2.43864 12.76985 0.07975 −2.68893 12.27376 0.07975 −2.96169 11.73578 0.07975 −3.25867 11.15938 0.07975 −3.58341 10.54949 0.07975 −3.93671 9.910228 0.07975 −4.31875 9.24588 0.07975 −4.72887 8.560732 0.07975 −5.16761 7.860206 0.07975 −5.63541 7.150146 0.07975 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−2.23862 18.81368 1 −2.32892 18.71634 1 −2.41254 18.55743 1 −2.51891 18.35459 1 −2.64949 18.1051 1 −2.80514 17.80686 1 −2.98635 17.45854 1 −3.19311 17.05936 1 −3.42525 16.60932 1 −3.68221 16.10896 1 −3.96326 15.55944 1 −4.26832 14.96294 1 −4.5966 14.32186 1 −4.94824 13.63965 1 −5.32562 12.92144 1 −5.73199 12.17345 1 −6.17016 11.40235 1 −6.64301 10.6156 1 −7.15305 9.821097 1 −7.7022 9.027119 1 −8.29114 8.241855 1 −8.91899 7.473019 1 −9.58314 6.727429 1 −10.2797 6.01137 1 −11.0041 5.330791 1 −11.7539 4.69367 1 −12.5314 4.115456 1 −13.3408 3.622347 1 −14.1778 3.246589 1 −15.0238 3.015009 1 −15.8475 2.939162 1 −16.6187 3.010356 1 −17.3191 3.204949 1 −17.9416 3.490762 1 −18.4933 3.828794 1 −18.9898 4.177159 1 −19.4483 4.494721 1 −19.8837 4.750404 1 −20.2981 4.924827 1 −20.6793 5.012375 1 −21.009 5.02372 1 −21.2741 4.982311 1 −21.4751 4.914073 1 −21.6203 4.839937 1 −21.7181 4.774886 1 −23.3299 5.532897 1.10225 −23.38 5.479446 1.10225 −23.45 5.399833 1.10225 −23.5514 5.272023 1.10225 −23.6794 5.083594 1.10225 −23.8205 4.821176 1.10225 −23.9494 4.473049 1.10225 −24.0254 4.032027 1.10225 −24 3.507811 1.10225 −23.8313 2.927027 1.10225 −23.5116 2.320905 1.10225 −23.0659 1.700348 1.10225 −22.5177 1.061925 1.10225 −21.8747 0.408815 1.10225 −21.1339 −0.2439 1.10225 −20.2891 −0.86925 1.10225 −19.3368 −1.42817 1.10225 −18.2734 −1.87661 1.10225 −17.1008 −2.16119 1.10225 −15.8475 −2.22301 1.10225 −14.5684 −2.01896 1.10225 −13.3258 −1.55648 1.10225 −12.1709 −0.85918 1.10225 −11.1363 0.031003 1.10225 −10.2259 1.059055 1.10225 −9.42411 2.174289 1.10225 −8.70982 3.339092 1.10225 −8.07023 4.529886 1.10225 −7.49191 5.727111 1.10225 −6.96055 6.91385 1.10225 −6.46891 8.078303 1.10225 −6.01541 9.212045 1.10225 −5.58819 10.30331 1.10225 −5.18128 11.34346 1.10225 −4.7944 12.32669 1.10225 −4.42321 13.24613 1.10225 −4.07702 14.10104 1.10225 −3.75883 14.88892 1.10225 −3.46708 15.60622 1.10225 −3.20061 16.2504 1.10225 −2.95989 16.82055 1.10225 −2.74531 17.31668 1.10225 −2.5578 17.74014 1.10225 −2.39782 18.09326 1.10225 −2.26534 18.37939 1.10225 −2.16015 18.60311 1.10225 −2.09715 18.77609 1.10225 −2.12512 18.90015 1.10225 −2.17753 18.96192 1.10225 −2.23053 18.99457 1.10225 −2.27399 19.00846 1.10225 −2.33325 19.01279 1.10225 −2.42318 18.98666 1.10225 −2.51586 18.89097 1.10225 −2.6025 18.73217 1.10225 −2.71331 18.5298 1.10225 −2.85022 18.28135 1.10225 −3.01448 17.98495 1.10225 −3.20696 17.6394 1.10225 −3.42785 17.24407 1.10225 −3.67734 16.79913 1.10225 −3.95472 16.30504 1.10225 −4.26003 15.76341 1.10225 −4.5932 15.17647 1.10225 −4.95421 14.54712 1.10225 −5.34676 13.88114 1.10225 −5.7759 13.18583 1.10225 −6.24727 12.4699 1.10225 −6.7658 11.74306 1.10225 −7.33445 11.01497 1.10225 −7.95328 10.29427 1.10225 −8.6192 9.587569 1.10225 −9.32684 8.898195 1.10225 −10.0682 8.227247 1.10225 −10.8335 7.573987 1.10225 −11.6124 6.937926 1.10225 −12.4018 6.323674 1.10225 −13.2038 5.740616 1.10225 −14.0254 5.209872 1.10225 −14.8687 4.76779 1.10225 −15.7157 4.457654 1.10225 −16.5294 4.30886 1.10225 −17.2856 4.319483 1.10225 −18.0023 4.471478 1.10225 −18.6911 4.747445 1.10225 −19.3193 5.087192 1.10225 −19.8893 5.422071 1.10225 −20.4265 5.70775 1.10225 −20.9428 5.921703 1.10225 −21.4314 6.052959 1.10225 −21.8762 6.101763 1.10225 −22.2594 6.081163 1.10225 −22.5755 6.01047 1.10225 −22.8248 5.910596 1.10225 −23.0126 5.802347 1.10225 −23.1463 5.70321 1.10225 −23.2363 5.624802 1.10225 −24.9622 6.471759 1.2045 −25.0177 6.413143 1.2045 −25.0959 6.326439 1.2045 −25.2112 6.188771 1.2045 −25.3612 5.988286 1.2045 −25.5368 5.712608 1.2045 −25.7218 5.347277 1.2045 −25.8851 4.882125 1.2045 −25.9823 4.311508 1.2045 −25.955 3.647588 1.2045 −25.753 2.921472 1.2045 −25.3731 2.171679 1.2045 −24.8405 1.413154 1.2045 −24.1749 0.654108 1.2045 −23.3962 −0.10481 1.2045 −22.5176 −0.86302 1.2045 −21.5391 −1.60564 1.2045 −20.4507 −2.28915 1.2045 −19.2342 −2.82941 1.2045 −17.8915 −3.14961 1.2045 −16.4685 −3.19316 1.2045 −15.0342 −2.9314 1.2045 −13.6589 −2.37551 1.2045 −12.4055 −1.55106 1.2045 −11.312 −0.51104 1.2045 −10.3863 0.681943 1.2045 −9.59362 1.958472 1.2045 −8.90393 3.275616 1.2045 −8.28879 4.602402 1.2045 −7.73091 5.919336 1.2045 −7.21153 7.209009 1.2045 −6.72267 8.460006 1.2045 −6.26594 9.665412 1.2045 −5.82672 10.81276 1.2045 −5.39956 11.89362 1.2045 −4.98425 12.90208 1.2045 −4.58226 13.83357 1.2045 −4.21245 14.69193 1.2045 −3.87642 15.4746 1.2045 −3.56942 16.17726 1.2045 −3.29238 16.79906 1.2045 −3.04482 17.33964 1.2045 −2.82761 17.80042 1.2045 −2.64157 18.18411 1.2045 −2.48697 18.49457 1.2045 −2.36363 18.73692 1.2045 −2.27975 18.92158 1.2045 −2.29982 19.06005 1.2045 −2.35489 19.12992 1.2045 −2.41248 19.16688 1.2045 −2.45711 19.18155 1.2045 −2.51804 19.1867 1.2045 −2.61131 19.16111 1.2045 −2.70563 19.06212 1.2045 −2.79758 18.90014 1.2045 −2.91572 18.69404 1.2045 −3.06266 18.44161 1.2045 −3.24005 18.14114 1.2045 −3.44911 17.79164 1.2045 −3.69032 17.3926 1.2045 −3.96425 16.94446 1.2045 −4.2698 16.44745 1.2045 −4.60824 15.90404 1.2045 −4.97929 15.31648 1.2045 −5.37947 14.68565 1.2045 −5.82088 14.02312 1.2045 −6.31967 13.34521 1.2045 −6.87918 12.66237 1.2045 −7.50194 11.98619 1.2045 −8.18221 11.32108 1.2045 −8.912 10.66872 1.2045 −9.68289 10.02705 1.2045 −10.484 9.393163 1.2045 −11.3002 8.766538 1.2045 −12.1209 8.148168 1.2045 −12.9464 7.542622 1.2045 −13.7872 6.963119 1.2045 −14.6611 6.433849 1.2045 −15.5763 5.995771 1.2045 −16.4793 5.707533 1.2045 −17.2262 5.592283 1.2045 −17.8647 5.591165 1.2045 −18.6516 5.714962 1.2045 −19.4331 5.963084 1.2045 −20.1459 6.272658 1.2045 −20.7944 6.58711 1.2045 −21.4075 6.87325 1.2045 −21.9997 7.10298 1.2045 −22.5631 7.251128 1.2045 −23.08 7.307181 1.2045 −23.5353 7.278052 1.2045 −23.9198 7.17959 1.2045 −24.2276 7.042706 1.2045 −24.4659 6.895775 1.2045 −24.6454 6.761611 1.2045 −24.7762 6.650932 1.2045 −24.8666 6.567428 1.2045 −24.9236 6.511329 1.2045

In the above Table 1, the plane Zadim=0 corresponds to the reference plane P0 situated at the base of the profile. This plane P0 is the intersection of the stacking axis AE of the set of vanes with the axisymmetric surface of the hub, i.e. it passes via the intersection between the axis AE and the surface 16A where it is assembled with the inner shroud 16. The plane Zadim=1 corresponds to the reference plane P1 situated at the top of the profile. This plane P1 is the intersection between the axis AE and the axisymmetric surface of the casing, i.e. it passes via the intersection of the axis AE with the surface 12A where it is assembled with the outer ring 12.

By convention, the stacking axis AE of the set of vanes, for the vane of a nozzle, is the axis that extends in the radial direction Z and passes through the middle of the inter-vane throat. For a given vane, the inter-vane throat is the location where the distance between the trailing edge of the vane in question and the suction side of the preceding vane in the direction of rotation of the turbine is at a minimum.

This is the axis on which the various X,Y sections of the set of vanes are “stacked” when designing the set of vanes.

As mentioned at the beginning of the present description, the aerodynamic profile of the invention is substantially identical to the nominal profile defined in the above table, i.e. it departs from said nominal profile by very little at most, being defined in particular within an envelope of ±1 mm in a direction normal to the surface of the nominal profile, and/or having X,Y coordinates lying within a range of ±5% relative to the coordinates X,Y of the nominal profile.

The coordinate Zadim is non-dimensional, i.e. for a point P, situated at a distance D from the plane P0 (where D is measured along the axis Z), the value of Zadim is D/H, where H represents the total height of the profile as measured between the planes P0 and P1. Naturally, in the Table 1 above, by multiplying the coordinate Zadim by the height H, it is possible to obtain the complete coordinates of the vane.

By way of example, the total height H is preferably about 115 mm±10%. By way of example, the plane P0 is situated at a distance of about 415 mm±10% from the axis A.

In the above table, the profile is characterized by seventeen section planes at constant Zadim coordinates, for which the coordinates X and Y are specified. These seventeen section planes include thirteen section planes located between Zadim=0 and Zadim=1, and thus arranged in the fluid stream, these section planes being distributed from P0 to P1. The seventeen section planes also include four section planes which are substantially outside the fluid stream (two section planes with Zadim<0, and two section planes with Zadim>1), these four section planes being provided for ensuring geometric continuity of the stacking, close to the head and the foot, respectively. In each section plane at constant coordinate Zadim, the section of the profile is given by a continuous and smooth curve, interconnecting all of the points (X,Y). In each section plane, the profile is interpolated so as to generate a uniform profile. Between the section planes, the profile is to be interpolated so as to generate a complete vane, as homogeneous as possible.

It is advantageous for the nozzle that includes the vane of the invention to have 140 to 160 vanes that present aerodynamic profiles as defined above. 

We claim:
 1. A turbine vane presenting an aerodynamic profile, the aerodynamic profile defining the turbine vane when cold and in a non-coated state, the aerodynamic profile being substantially identical to a nominal aerodynamic profile determined by Cartesian coordinates X,Y,Zadim given in Table 1, in which coordinate Zadim is a quotient D/H, where D is a distance of a point under consideration from a reference X,Y plane situated at a base of the nominal aerodynamic profile, and H is a height of said aerodynamic profile measured from said reference X,Y plane out to an end of the turbine vane, the measurements D and H being taken radially relative to an axis of the turbine vane, while coordinate X is measured in an axial direction of the turbine vane.
 2. The turbine vane as claimed in claim 1, wherein said aerodynamic profile is defined within an envelope of ±1 mm in a direction normal to a surface of the nominal aerodynamic profile.
 3. The turbine vane as claimed in claim 1, wherein coordinates X,Y of said aerodynamic profile lie within a range of ±5% relative to coordinates X,Y of the nominal aerodynamic profile.
 4. The turbine vane as claimed in claim 1, wherein the turbine vane is a nozzle vane forming a part of a stator of a turbine.
 5. The turbine vane as claimed in claim 4, wherein the turbine vane is a nozzle vane of a fourth stage of the turbine.
 6. The turbine vane as claimed in claim 4, wherein the turbine has seven stages, and wherein the turbine vane is a vane of a fourth stage nozzle of the turbine having seven stages.
 7. A turbine, including a plurality of turbine vanes as claimed in claim
 1. 8. The turbine as claimed in claim 7, including a nozzle that is stationary in rotation having 140 to 160 turbine vanes that each present the aerodynamic profile.
 9. A turbine nozzle forming a portion of a turbine stator, wherein all turbine vanes of the turbine nozzle present the aerodynamic profile of the turbine vane as claimed in claim
 1. 10. A turbine nozzle as claimed in claim 9, wherein the turbine nozzle is stationary in rotation, and wherein the nozzle has 140 to 160 turbine vanes that each present the aerodynamic profile. 